dimented24x7

Will the hardware in the ECMs/PCMs accept the signal from the VSS directly with no buffer box? I have a TKO with a fnord pickup and I want to feed it into my tbi PCM so I can have non-bouncy mph in my datalogs, or maybe also drive a speedo as well.

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dimented24x7

I take it ill need a buffer box of some sort? It already has teh right number of PPM. Something like ~2200 if my calcs are correct.

JPrevost

Vats?

dimented24x7

To clarify, my question is will the current VSS input accept the VSS sensor output directly without a buffer and have no ill effects?

JPrevost

oh, I have no clue, good luck with that.

HaulnA$$

I don't think so, but a buffer for a reluctor signal is a simple circuit. HTH

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dimented24x7

Ok, thanks. Thats what I thought...

yager

I am interested in what you find out.

I had found this site with some VSS info . Im looking to make my own using ABS or other VSS sensor, this site help me some..

To me it sounds like i could use any 'digital' vss sender and simply adjust code to make it correct???

link:
http://www.magsensors.com/vssapps.html



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heres a very poor cut past as i hate searching and finding dear URL/Links
[MSC Vehicle Speed Sensors Applications

Accessories
Nearly all aftermarket accessories that utilize vehicle speed data are programmable for a wide variety of signal sources and pulse rates. This is to accommodate the 4 and 8 pulse VSS signals from earlier EFI engines, as well as the much more frequent signals generated by later vehicles with ABS.
However, most electronic speedometers and cruise control units are optimized for a specific rate for better performance. BRAND RECOMMENDED VSS
ELECTRONIC SPEEDOMETER
Auto Meter 16 Pulse Hall Effect
Classic Instruments 8 Pulse Hall Effect
Dakota Digital 8 Pulse Hall Effect
Stewart Warner 8 Pulse Hall Effect
VDO 16 Pulse Hall Effect
CRUISE CONTROL
Rostra 16 Pulse Hall Effect





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EFI/ECM Pulses per Mile (PPM) Specifications

DOMESTIC AUTOMOBILES & TRUCKS Make Model Years Type PPM PPR Signal
BUICK All Models All Computer Carb 2,000 2 Digital
All Models All TBI 2,000 2 Digital
All Models 90-97 TPI 4,000 4 Analog
CHEVROLET All Models All Computer Carb 2,000 2 Digital
All Models All TBI 2,000 2 Digital
All Models 90-97 TPI 4,000 4 Analog
CAMARO 90-93 3.1L, 3.4L V6 4,000 4 Analog
CORVETTE 90-93 LT-1 4,000 4 Analog
CHEVROLET
and GMC
Trucks & Vans All Models All Computer Carb 2,000 2 Digital
All Models All TBI 2,000 2 Digital
All Models 90-97 TPI 4,000 4 Analog
CHRYSLER Most Models 92-97 8,000 8 Digital
CIRRUS, BREEZE, AVENGER 97 4,000 4 Digital
DODGE Most Models 92-97 8,000 8 Digital
COLT 92-96 4,000 4 Digital
RAM 50 92-93 4,000 4 Digital
SUMMIT 92-95 4,000 4 Digital
EAGLE TALON 95-97 4,000 4 Digital
VISION 93 8,000 8 Digital
FORD Most Models 92-97 8,000 8 Digital
ASPIRE 95-97 4,000 4 Digital
GEO All Models 92-97 4,000 4
JEEP All Models 92-97 8,000 8 Digital
MERCURY Most Models 92-97 8,000 8 Digital
CAPRI 92-94 4,000 4 Digital
VILLAGER 95-96 4,000 4 Digital
OLDSMOBILE All Models All Computer Carb 2,000 2 Digital
All Models All TBI 2,000 2 Digital
All Models 90-97 TPI 4,000 4 Analog
SILHOUETTE 96-97 TBI 2,000 2 Digital
PLYMOUTH Most Models 92-97 8,000 8 Digital
COLT 92-96 4,000 4 Digital
SEBRING, STRATUS 97 4,000 4 Digital
PONTIAC All Models All Computer Carb 2,000 2 Digital
All Models All TBI 2,000 2 Digital
All Models 90-97 TPI 4,000 4 Analog
TRANSPORT 96-97 TBI 2,000 2 Digital



ASIAN IMPORTS Make Model Years PPM PPR
HONDA All Models 93-97 4,000 4
KIA All Models 95-97 4,000 4
HYUNDAI All Models 92-97 4,000 4
MAZDA Most Models (except RX-7) 92-97 4,000 4
B-2300, B-3000, B-4000 94-97 8,000 8
MITSUBISHI All Models 92-97 4,000 4
NISSAN All Models 92-97 2,000 2
SUBARU All Models 92-97 4,000 4
SUZUKI All Models 92-97 4,000 4
TOYOTA All Models 92-97 4,000 4

]

junkcltr

Check out the National Semiconductor LM1815. Digikey has them. It takes in an AC magnetic reluctor signal and spits out a square wave.

J

MrDude_1

i think i might have used that one before.... if it is the same one i used, it worked GREAT. took out some phantom signals my PIC was getting....

junkcltr

It probably is. Has been around for a long time. $3.50 at Digikey, few pins to hook up and it removes the phantom signals that you mentioned.

J

junkcltr

I think the easiest thing to do is use a yellow or white VSS buffer box off one of the MAF equipped magnetic VSS buffer boxes from a TPI setup.
This will convert the AC VSS signal to digital with the 747 ECM requires. I guessed at the 747 ECM because sig. says TBI.

J

dimented24x7

computer will be an 8625. I would assume the hardware is set up in a similar manner?

junkcltr

I am not familiar with the TBI setups. I am assuming the car has an optical VSS at the speedo head, true??
If the computer originally came from a vehicle that had an optical VSS and you want to install a magnetic VSS, then install the yellow/white buffer box and you should be all set.

J

RocketSled

Worst comes to worst, there's also an $80 converter box from Dakotadigital.com

I've got one on order to recalibrate for my 3.54 gears. My ECU is the generation BEFORE you could recalibrate in the ECU.